Exposure timing mechanism



May 23, 1950 J. BoLsEY EXPOSURE TuING MECHANISM Original Filed Jan. 27, 1944 5 Sheets-Sheet l INVENTOR:

' JACZVU BOLSEY gill im Q s Original Fled Jan. 27, 1944 5 sheets-sheet 2 IN VEN TOR:

JACQUES BOLSEY May'23, 1950 J. BoLsEY 2,508,935

EXPOSURE TIMING MECHANISM Original Filed Jan. 27. 1944 5 Sheets-Sheet 3 I IIIHI lllllllllllllllllllllll l IIIIIHIHHI I N VEN TOR.' JA Caz/5 @OLS Ey wim May 23, 1950 J. BQLsEY- EXPOSURE TIMING MECHANISM Original Filed Jan. 27, 1944 5 Sheets-Sheet 4 INVENTOR.

NW x L, W w... MIJ.

v. U wm uw mm May 23, 1950 J. BoLsEY EXPOSURE 'mams MECHANISM Original Filed Jan. 1944 5 Sheets-Sheet 5 INVENTOR,

mmv.; ma NN. mwgmn Si atented May 23, 19540 j V-Ul \II-TI:`.D STATES PATENT OFFICE 1, f Jp 508,935

l y EXPOSURETIMING MECHANISM 'Jacquesolse New York, N. Y. l(')riginal application January 27, 1944, Serial No.

519,902, now Patent No. 2,412,559, dated December 17, 1946. lDivided and this application October `18, 1946, Serial No. 703,953

i The present application is'a divisional application of'my copending United Statespatent applic'ation' `Serial No. '519,902'," led January 27, 1944, and entitled Shutter actuating mechanismsonfyvhich the U. S. Patent No. 2,412,559 has/been issued'oniDecember 17, 1946.

Mypresentinvention'relates to shutter actuating mechanismsv and morev particularly to mechanisms for operating so-called sliding reciprocating shutters.

vIt is an object of my present invention to provide a shutter mechanism which is extremely simple in construction, easy to operate and reliable inl use.

It is a further object of my present invention to provide a shutter mechanism which is set and controlled by one single setting knob.

It is still a further object of my present invention to provide a shutter mechanism which is very compact and can be removed as a single unit from the camera bodyfor examination and repairs, if necessary.

With the above objects in view, my present invention mainly consists of a shutter actuating mechanism comprising a manually operated setting member for setting the various longer and shorter exposure times, spring means for moving the shutter blade past the exposure aperture of the camera, means controlled by the setting member for varying the tension of the above mentioned spring means so as to increase the spring tension when the exposure times has to be shortened, and delayed action means for reducing, at least during the longer exposure times, the speed of the shutter blade while the same is moved by the spring means past the exposure aperture. The spring members used for the purposes of the present invention is preferably a relatively long coiled spring and the delayed action means preferably comprise a gear member and braking means engaging the teeth of this gear member.

/ As set forth above, preferably the length of the shorter exposure times is controlled exclusively by the tension of this coiled spring while the length of the longer exposure times is controlled by the number of teeth engaging the braking means delaying turning of the delaying gear member. Thus, the length of the shorter exposure times is varied by the setting member, e. g. setting knob, by variation of the tension of the coiled spring While the length of the longer exposure times is varied by change of the number of teeth of the toothed `gear member engaging thebrakingmeans;- In accordance with the pres- '7 Claims. (Cl. 95-55) ent'invention, all these variations are carried out exclusively by turning of a single setting knob.

My present invention furthermore comprises the Aprovision of means for enabling Bulb and Time exposures which are controlled by the same setting knob. For this purpose, the shutter blade actuating mechanism also comprises means for moving the shutter blade past the exposure aperture of the camera against action of the coiled shutter spring mentioned above, means for holding this shutter blade in its wound-up position and to release the same for operative movement past the exposure aperture, and movablei blocking means adapted to be moved into the path of the shutter blade so as to hold the same in operative position with the shutter aperture in register with the exposure aperturev of the camera; in accordance with my present invention, these blocking means are movably, preferably turnably, secured to the camera body; furthermore, I provide means operatively connecting the setting member described above with this movable supporting member in such a manner as to enable movement of the blocking means movably carried by this supporting member into such a position as to be adapted to be moved by the releasing 'means mentioned above into the path of the shutter blade when the same is released by movement of these releasing means. Thus, movement of the releasing means simultaneously releases the shutter blade for operative exposing movement and moves the blocking means into the path of this shutter blade so that the shutter blade is held in exposing position with the shutter aperture superimposed upon the exposure aperture of the camera; when said releasing means then are allowed to return to their initial position, the blocking means move out of the path ofthe shutter blade and the same moves on, closing the exposure aperture. Thus, by regulating the length of time of operation of thereleasing means, it is possible to regulate the length of the Bulb exposures. Time exposures are ralso obtained in similar manner which will be described below in detail. Y

The novel features which I consider as characteristic for my invention are Set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specie embodiments when read in connection with the accompanying drawings, in which Fig. 1 isarear View of the entire shutter mechanism, with the shutter blade and obturation blade shown in dotted lines;

Fig. 2 is a cross section through the shutter mechanism shown in Fig. 1, along line 2 2 of Fi 1;

xtig. 3 is a cross section through the shutter mechanism, along line 3-3 of Fig.

Fig. 4 is a cross section through the same shutter mechanism, along line l-fi of Fig. 1;

Fig. 5 is a bottom view partly in section oi' the shutter mechanism shown in Fig. 1;

Fig. 6 is a top view of the same shutter mechanism;

Fig. 7 is a vertical section through the shutter mechanism, along line loic Fig. 2;

Fig. 8 is a partial vertical section 'through the shutter mechanism, along line S-S of Fig. 2; and

Fig. 9 is a horizontal section along line 9-9 of Fig. 2.

The entire shutter mechanism is mounted into a front compartment of the camera which is formed by the compartment iront wall I3, the top wall II and the bottom wall i2; both walls Il and I2 are secured to front wall i2. These three walls carry the entire shutter actuating mechanism and simultaneously form the front part of the camera, not shown in the drawing; they are secured to the camera body by screws entering screw holes i3, I4, l5, and l5 in the top wall and bottom wall l2, respectively, and can be removed together with the shutter mechanism as a separate unit, whenever required.

The main part of the entire shutter mechanism is the shutter blade |'l guided in grooves I8 and I3 provided in the top and bottom walls and l2, respectively. This shutter blade ll is provided with a shutter aperture 2B shown in Figure l in dotted lines. The guiding grooves I8 and I9 extend all over the length of top and bottom walls |I and |2 thereby enabling sliding of the shutter blade in direction of arrow G3 along the entire length of these walls from one side of the exposure aperture 2| of the camera to the other side thereof and back.

A second obturation shutter 22 is also pro vided, closing the shutter aperture 23 during movement of the shutter blade |1 against direction of arrow 63 past the exposure aperture 2|, while this shutter blade Il is slid into the socalled initial wound-up position ready for exposure. The obturation shutter 22 is also provided with an aperture 23 corresponding in size to the exposure aperture 2| and designated in Fig. l with the same outline as the latter.

It should be mentioned that front wall |S is also provided with an aperture 24 in front of exposure aperture 2| so as to enable light to reach the lens within the camera body through the superimposed apertures 2| and 23 when shutter blade l1 and obturation shutter 22 are in operative position.

The main means for moving the shutter blade |1 during exposure is the coiled spring 25 secured at its one end to pin 26 secured to the shutter blade I1 as shown in Fig. 1 and Fig. 'l and secured at its other end by pin 21 to pulley 28 connected by screw 29 with setting knob 30, which latter is rotatably journalled in front wall I0. Thus, by turning the setting knob 30 the length of the coiled spring 25 is varied and its tension decreased or increased according to the direction of turning of knob 30. Since during elongation of spring 25 part of the same is wound up on pulley 28, the active length of this spring is, simultaneously decreased, thereby additionally Same l;

Cix

increasing the spring tension. In order to increase the length of spring 25, the same is guided over the two guiding rollers 3| and 32 as shown in Figures 1 and 6.

It is evident that such a coiled spring 25 is only adapted for obtaining the shorter exposure times since the shutter speed caused by such a spring is considerable. Thus, it is possible to vary the tension of spring 25 by means of setting knob 3E) within such limits as to ob tain exposure times varying between 1/ioo and l/1000 of a second. For obtaining longer exposure times, i. e. in order to decrease the shutter speed, I have to provide separate delayed action means combined with the coiled spring 25.

These delayed action means comprise mainly a toothed gear segment 33 turnably pivoted to front wall l0 by means of pivot 34 as clearly shown in Fig. 2. The torsional spring 35 is wound upon the sleeve member 3B which latter is attached to the toothed gear segment 33; this spring 35 is secured at its one end to this sleeve member 36 and at its other end at 31 to the front wall I 3, urging segment 33 to turn about pivot 34 in direction of arrow 38. Thus, whenever segment 33 is turned against direction of arrow 38 and then released, it automatically returns into its initial position shown in Fig. 1.

In order to adjust the length of exposure tiznes it is necessary to regulate this initial position of gear segment 33. This is done by providing on the rear face of segment 33 a semi-circular projection 39 engaging pin 40 secured to lever 4i as shown in Figs. l and 2. This lever "il is turnably secured to front wall l5 by means of pivot urged in direction of arrow 55 by means of torsional spring 43 wound upon sleeve 44, and turned about pivot 42 by pin d8 engaging edge 4l' ci this lever against direction of arrow Q5, whenever pin i3 is moved against this lever edge 3i". This pin is secured rigidly connected with setting knob 33 by means of the intermediate cam member i3 serving also for other purposes described below in detail, and screw 29 to which the latter r rJer "33 is secured. Thus, it is possible to turn pin t3 about the pivoting axis of setting knob 2Q by turning this setting knob.

This turning movement of pin 46 will result in pressure of pin 4S against edge #il of lever arm lll, turning the same against direction of arrow 35. This movement of lever arm 4| will result in pressure of pin @le against projection 39 on segment 33, turning this segment about pivot 3st against direction of arrow 33. Thus, it is possible to turn the toothed gear segment 33 about its pivot 34 against direction of arrow 33 by turning knob 3e and to vary the so-called initial position of this toothed gear segment. The thus obtained initial position of the toothed gear segn'ient will be the one into which it will always tend to return by action of spring 35 if turned against direction of arrow 38. It is evident that when pin 65 is turned by setting knob 30 in such a direction as to decrease its pressure against lever arm 4i, the same will be turned by the torsional spring 43. together with pin "t3 secured to it in direction of arrow 45, thus following this pin enabling the toothed gear segment 33 to turn in direction of arrow 38.

A further element of the delaying action means used in the mechanism is a pawl 53 engaging wi h its proiections 5l and 52 the teeth 53 of the toothed gear segment 33 in the way shown in Fig. 1. This pawl 50 is freely turnably secured to pivot d2 by pin 54. It is evident that a paf/1 of this ty-pe will brake the speed of turning of the toothed gear segmentf33 when the same is turning about itsV pivot; 34 -in either direction.

In order to obtaininiiuence of the above described delayed action means on the movement of the shutter blade, I provide on the shutter blade l1 the double-armed operating lever 55 shown in Figures 1 and 3. This operating lever is freely turnably pivoted to theshutter blade l1 by means of pivot 5G and urged .by leaf spring 51 to turn in direction of arrow 58. Such turning movement of the double-armed lever 55 is limited by pivot 59 of leaf spring 51 against which the lever arm 60 of the double-armed lever 55 is pressed by the leaf spring 51. Thus, the other lever arm Si of the double-armed lever 55 cannot move further in'direction of arrow 58 than shown in Figure 1 but it can turn about pivot 53 against direction of arrow 58 if forced to do so. If released after such turning movement against direction of arrow 58, this lever arm 6I returns into its initial position, shown in Fig. 1, by action of leaf spring 51.

The last element necessary to obtain the required cooperation between this operating doublearmed lever 55 on shutter blade l1 and the toothed gear member 33 is a projection 52 on this gear segmentarranged in such a manner as to be in the path of lever arm 5l of the doublearmed lever.55 when the shutter blade l1 carrying thellever 55 is moving in direction of arrow 63 during exposure.

The above described means for setting the exposure time operate as follows:

(1) When short exposure times are required, the setting knob 3G is turned so as to turn by means of pin 45 the lever 4l against direction of arrow 45 into such a position that this lever dl on its part turns by means oflpin' 45 and projection 33 the toothed gear segment 33 against direction of arrow 38 into the end position shown in Fig. 1 in dotted lines. In this end position, projection 52 on gear member 33 is outside of the path of lever arm 5I and thus sliding of the shutter blade I1 is not influenced by the gear segment 33 forming part of the delayed action means. After this end position of thevtoothed gear segment 33 is reached, tension of the coiled spring 25 is adjusted by turningsetting knob 33 as required, i. e. the .tension of spring 25 is increased if very short and decreased if so called short exposure times are desired. In this way, exposure times between 1/ion and l/inoo of a second may be obtained.

(2) If longer exposure times are required, the setting knob 3o is moved so that the toothed gear segment 33. is turned in direction of arrow 33, thereby moving projection 52 secured to segment 33 into the path of lever arm 5l of the operating double-armed lever 55 secured to shutter blade l1.

Now, it is evident that if for instance segment 33 is in its position shown in Figure 1 in full lines, the lever arm El which is secured to shutter blade I1, as explained above, will strike the projection 52 during its operative movement in direction of arrow 83. Since shutter blade I1 is moving in direction of arrow 53 by action of coiled spring 25 which is substantially stronger than the torsional spring 35 turning segment 33 in direction of arrow 38, the lever arm 6l will push, by action of spring 25, the projection 62 .against action of spring- 35 in direction of arrow 63, thereby turning gear segment 33 against direction of arrow 38.

This turning movement, however, is braked by pawl 5U, limiting -thQSPeed ofthe same. Thus it will take a certain time untilse'g-inent rmoves. from its initial positionshown infull lines intoitsend position, shownin Fig. -1 in dotted lines. Durf, ing this time,` the shutter will move only a veryr short distance. Since theshutter opening 20 is larger than the exposure aperture 2| and `lever 55 is arranged in such a manner :that -levenlarm 6| strikes against projection '62 at that moment when shutter opening 20 is in front ofV exposure aperture 2|, this exposure aperture will be open and exposure willy continue duringv the entire period needed for movement of segment 33 from its initial into its iinal position. -Thus,this. segment and the pawl 50 connected; with it :willresult in extension of the `exposure time, making longer exposures possible. j .1

Everybody skilled in this artwill easily under-,- stand that by reducing the number of those teeth of segment 33 whichengagepawl 50"duringits movement from initial intofinal position itis possible to vary the period of time during-which movement of shutter blade I1 is delayed, i.' e. the time during which shutter aperture 20 is in front of exposure aperture 2i. Thus, it is possible to vary the length of the longer exposure times by varying the initial position of gear segment 33; this will result in variation of the number'of gear teeth 53 engaged by pawl 50 during turning of gear segment 33 from the thus obtained different initial positions into its end position.

Such adjustment of the initial position Yof gear segment 33 can easily be attained by the adjusting means described above, namely by means of pin 46, lever 4I, pin 4U, and projection'39: Thus, by turning setting knob 33 in an appropriate way, it is possible to turn pin 46 about pivot 29 as explained above, thus pressing this pin against the edge 41 of lever fil, thereby pushing pin- 40 against projection 39 and turning segment 33 to which this projection is secured against direction of arrow 33. Since it is possible to turnI pin 46 by means of setting knob 30 in such a manner as to obtain any desired position of gear segmentl 33 between the positions shown in full lines and that shown in dotted lines, it is also possible to adjust, by means'of this setting knob, the longer exposure times of shutter blade I1-within wide limits, i. e. within the very short expos-ure time obtained by the delaying movement of segment 33 from its initialposition shown in full lines into its end position shown in dotted lines-and the practically undelayed exposure .time of the shutter obtained if segment 33'isturned into an initial position near its end position, shown in Fig. 1 in dotted lines already before start of themovement of the shutter.

I wish to mention that r for arming the shutter spring, i. e. for moving the-shutter blade I1 into its initial position shown in Fig. 1 in dotted lines, I use knob 35 and connecting. member 14 passing through slot 55 `in front wall I0 andslot 61 in the shutter blade I1. If this Vknob is moved in direction of .arrow 68 as shown in Fig. 5, the shutter blade I1 is moved into its initial position shown in Fig. 1 stressing thereby spring 25 and increasing its tension. In this initial position, the shutter blade l1 is heldby projection 69.

on releasing member 10. '.Thispin is adapted to engage pin 12 secured to shutter blade l1, holding the same in its initial position.

v I wish also to mention .that the, obturation shutter 22 is arranged parallelto shutter blade l1 and rmly connectedb'y'meansofscrew 13.to

connecting member 14 which latter, as explained above, passes through slot .66, in ,front-wall Ill 7 'and slot`6'l in shutter blade This obturation shutter 22 is provided with a separate coiled spring 'l5 passing over guiding roller 'ISand pulling it back into its initial position at the left side of the exposure aperture 2| as shown in Fig. 1.

-In order to obtain also bulb and time exposures, i. e. in order to make it possible to expose for half a second or longer, I have to provide additional means to prevent movement of the shutter blade while the shutter aperture is in front of the exposure aperture i the camera.

For this purpose I `use lever 80 which is turnably pivoted to the top wall I by means of pivot 8| in the way shown in Figs. 1 and 3. The tip 9810i lever arm 82 of this lever 88 is permanently pressed against the peripheral face 84 of the camlike member 48 by means of springs 83 and 83. This cam-like member 48 is provided with a recess 85 for the purposes described below. In the position shown in Fig. 1, tip 98 of lever arm 82 of the lever 88 presses against the annular portion 86 of the peripheral face 84 of the cam-like member 48 and is thus held by this member 48 in a position enabling regulation of the length of exposure time by the means described above in detail.

Lever 88 is provided besides with lever arm 82 also with lever arm 81, carrying at its end freely turnably mounted the blocking member 88 which is secured to it by means of pivot 89, as shown in Fig. 1. This blocking memberl 88 is provided. with two catch projections 88 and 9| shaped and arranged. as shown and also'provided with slot 92, engaging pin 93 arranged on releasing member '18.

It is evident that by turning lever 88 about its pivoting point 8| in direction of arrow 84, it is possible to lift pivot 88 and blocking member 88 held by it. Such movement of pivot 89 in direction of arrow 95 will result also in turning of blocking member 88 about this pivot 89 in direction of arrow e8; this turning movement is caused by pin 93 which is stationary and sliding in slot 92 forces blocking member 88 to turn about pivot 88. This combined turning and raising or the blocking member 88 will also result in a similar movement of the catch projections 8l) and 9|, so that the same will move in direction of arrow 85.

The extent oi such movement of the catch projections 8: and 9| will depend on the extent of Yturning of lever 88 about pivot 8|: if this lever is turned only slightly, it is possible to turn blocking member 88 in such. a way that catch projection 8| is in the path of pin 'l2 on the shutter blade I'l if the releasing member 'l0 is pushed downward. I wish to stress that if such effect is required, the blocking member 88 should not be turned so far that catch projection 9| is in the path or projection l2 on shutter blade |l already before downward movement of the releasing member 78. If this were the case, pushing down of the releasing member I8 during releasing of shutter blade Il would still further lift catch projection 9! by turning blocking member 88 about pivot 88 and thus move this catch projection 9| out of and over the path of projection 12 on shutter blade Il. Thus, it is necessary for the purposes of the present invention to turn blocking member 88 into a position in which catch projection 8| is slightly below the level of projection l2 on shutter blade Il if it is desired that during release of this shutter blade this projection 9| is in the path of the projection 12 on the shutter blade Similarly, it is possible to lift also catch projection into the path of projection 12 on shutter blade However, also in this case it is necessary to limitr movement of the pivot 89 of block ing vmember 88 in such a manner that the catch projection l90 is slightly below the level of projection 12 on shutter blade Il; thus, if the shutter blade is released by pushing down the releasing member 10, the catch projection 90 is turned exactly into the path of the projection 'l2 on the shutter blade Il. v

The-above described means for obtaining bulb and time exposures of desired length are operated as follows: Y

(1) If it is required to keep the exposure aperture open while the releasing member 10 is pressed downward, i. e. to make a bulb exposure, 'it is necessary to turn lever 8D in such a manner that catch projection `9| is slightly under the path oi projection "l2 on shutter blade as explained above. This position of lever 80 can be obtained by suitable adjustment of the lposition of the earn-like member 48 by means of the setting member 38 to which it is secured.

If the setting member is turned in clockwise direction, such a turning 'movement will cause turning of the cam-like member 48 about its axis in the same direction, and the Same will face the tip 98 of -lever arm 82 with its recessed portion 85. This will result in turning of levei` 88 about its pivoting point 8| by action of spring 83. Now, if setting member 3U is adjusted in such a manner that tip 98 of lever arm 82 contacts the middle portion 98 of the receding peripheral face 84 of the cam-like member 48, the leverarm 88 will be in such a position that blocking member 88 is somewhat lifted with catch projection 9| slightly under the path of projection 1| on shutter blade If, after adjusting the blocking member 88 in this way, shutter blade Il is moved into its initial position shown in Fig. l and then released by pushing down the releasing member '10, projection l2 on the shutter blade will strike against the catch projection 98 which has been lifted by the pushing down movement of releasing member '.18 into the path of projection 12. Thus, this catch projection 8| will block further movement of projection l2 on shutter blade and hold the latter in operative position with its shutter aperture 20 in front of the exposure aperture 2| of the camera. After the shutter has been held in this operative position for the required length of time, the releasing member 'I0 is allowed to return into its initial position by action of spring |08. As evident from above explanation, this return movement of the releasing member 10 will result in a turning movement of blocking member 88 about pivot 89 in direction of arrow which in turn will cause movement of catch projection 9| downward out ofthe path of projection 12 on shutter blade Il; the thus released shutter blade |l will continue in its sliding movement and close the exposure aperture 2| of the camera.

(2) If it is required to make a time exposure, i. e. ifit is desired to open the exposure aperture 2| by pushing down the releasing member 'l0 and to close the exposure aperture 2| only when the releasing lever I0 is Ypushed down a second time, it is necessary to turn setting member 38 in such a position that the cam-like member 48 contacts tip 98 of lever arm 82 with the deepest p art `|E|| of recess 85, thereby enabling lever arm 80 to turn by action of spring 83 still further in .film exposures.

direction of arrows 94, causing further lifting of pivot 89 in direction of arrow 95. In this way, it is possible to move blocking member 88 into such a position that when releasing member 10 is pushed downward, this blocking member 88 is turned about pivot 89 into such a position that projection 12 on shutter blade Il strikes during its movement in direction of arrow E53 against catch projection 90 on this blocking member,

'preventing further movement of the shutter blade.

When the releasing member 19 is allowed to return into its initial position, blocking member 88 will turn, as explained above, in direction of arrow 95 and projection |2 on shutter blade will become disengaged from catch projection 55 and the shutter blade I1 continue in its operative sliding movement in direction of arrow 63. However, the two catch projections 99 and 9| are arranged relative to each other in such a manner that when catch projection 90 returns by release of releasing member 10 into its initial position, catch projection 9| turns downward into the path of projection 12 on shutter blade Il, thus preventing further movement of the same and keeping the exposure aperture open, as explained above.

Thus, it is possible to move blocking member 88 into such a position that by pushing down and releasing of relasing member 19, the shutter blade |'I is moved into operative position and held in that position by catch projection 9|. In order to release the shutter blade I7 after the required length of exposure time, it is only necessary to push down the releasing member 19 again, thereby moving catch projection 9| out of the path of projection 12 and enabling shutter blade to continue its operative movement under action of shutter spring 25.`

The above described arrangement makes it possible to obtain the most different shutter speeds and exposure times in an extremely simple way by means of a `mechanism containing very few parts cooperating with each other in a very reliable manner.

It is evident that the above described shutter mechanism might be combined with a counting mechanism for counting the exposures in a way known to everybody skilled in the art, for instance by arranging such a counting mechanism in the path of the shutter blade |1 or another part of the mechanism carrying out a predetermined movement during each to and fro movement of the shutter blade. A counting mechanism of this type is shown in the drawings. This counting mechanism consists of a ratchet wheel y E35 arranged so as to turn each time the shutter is moved. With this ratchet wheel |95 a shaft Ais connected which carries on its other end `theindicating dial |51. In order to prevent turning of ratchet wheel |05 in undesired direction, I

provide the pawl member |9 which is pivoted by means of pivot to the housing and engages the teeth of the ratchet wheel |05 as shown. Since the lm is transported at the same time when the shutter is armed, each shutter movement is a clear indication for the number of I wish to stress that this counting mechanism does not form part of the invention claimed by me in the appended claims.

. It will be understood that each of the elements described above, or two or more together, may alsofind a useful application in other types of 4shutter mechanisms/differing from'thetypes described above. i u

While I have illustrated and described the in'- vention as embodied in so-called sliding reciproeating shutter mechanisms, I do not intend to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of my invention.

Without further analysis, the foregoing will so fully reveal the gist of my invention that others can -by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention, and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a shutter blade actuating mechanism including a shutter blade; an engaging member combined with said shutter blade; a shutter releasing member manually movable between shutter holding position and shutter releasing position; a manually operable exposure setting member adapted to be in bulb exposure setting position and in time exposure setting position and' to be moved between said positions; and operating means combined with said exposure setting member and adjustable by the same; the provision of a blocking arrangement comprising in combination a movable supporting member combined with said operating means and also adapted to be moved by said shutter releasing member during movement of the same; rst catch means combined with said movable supporting member so as to be locatedwhen said exposure setting member is in bulb exposure setting positionin the path of said engaging member while said shutter releasing member is in shutter releasing position and outside of said path while said shutter releasing member is in shutter holding position and to be located-when said exposure setting member is in time exposure setting positionin the path of said engaging member while said shutter releasing member is in shutter holding position and -outside of said path while said shutter releasing member is in shutter releasingposition; and second catch means combined with said movable supporting member so as to be locatedin the path of said engaging member only when said exposure setting member is in time exposure setting position and said shutter releasing member is in shutter releasing position.

2. In a shutter blade actuating mechanism including a shutter blade; an engaging member combined with said shutter blade; a shutter releasing member manually movable between shutter holding position and shutter releasing position; a manually operable exposure setting member adapted to be in bulb exposure setting position and in time exposure setting position and torbe moved between said positions; and operating means combined with said exposure setting member and adjustable by the same; the provision of a blocking arrangement comprising in combination a movable supporting member movably mounted on said operating means and also adapted to be moved by said shutter releasing member during movement of the same; first catch means mounted on said movable supporting member so as to be located-when said exposure setting member is in bulb exposure setting position-- in the 'path of said engagingmember while said shutter releasing member is inv shutterreleasing position and outside of said path while said shutter releasing member is in shutter holding position and to be located-when said exposure setting member is in time exposure setting positionin the path of said engaging member while said shutter releasing member is in shutter holding position and outside of said path while said shutter releasing member is in shutter releasing position; and second catch means mounted on said movable supporting member so as to be located in the path of said engaging member only when said exposure setting member is in time exposure setting position and said shutter releasing member is in shutter releasing position.

3. In a shutter blade actuating mechanism including a shutter blade; an engaging member mounted on said shutter blade; a shutter releasing member manually movable between shutter holding position and shutter releasing position; a manually operable turnable exposure setting knob adapted to be in bulb exposure setting position and in time exposure setting position and to be turned between. said positions; and an operating double-armed lever operatively connected at one end to said exposure setting knob so that its position is adjusted by turning of said knob; the provision of a blocking arrangement comprising in combination a turnable supporting member turnably mounted on the other end of said operating lever and also adapted to be moved by said shutter releasing member during movement of the same; first catch means mounted on said turnable supporting member so as to be locatedwhen said exposure setting knob is in bulb exposure setting position-in the path of said engaging member while said shutter releasing member is in shutter releasing position and outside of said path while said shutter releasing member is in shutter holding position and to be located-when said exposure setting knob is in time exposure setting positionin the path of said engaging member while said Shutter releasing member is in shutter holding position and outside of said path while said shutter releasing member is in shutter releasing position; and second catch means mounted on said turnable supporting member so as to be located in the path of said engaging member only when said exposure setting knob is in time exposure setting position and said shutter releasing member is in shutter releasing position.

4. In a shutter blade actuating mechanism including a shutter blade; an engaging member combined with said shutter blade; a shutter releasing member manually movable between shutter holding position and shutter releasing position; a manuallyoperable exposure setting member adapted to be in bulb exposure setting position and in time exposure setting position and to be moved between said positions; and operating means combined with said exposure setting member and adjustable by the same; the provision of a blocking arrangement comprising in combination a turnable supporting member turnably mounted on said operating means and engaging said shutter releasing member so as to be adapted to be moved by the same during movement of said shutter releasing member; first catch means mounted on said turnable supporting member so as to be locatedwhen said exposure setting member is in bulb exposure setting position-in the path of said engaging member while said shutter releasing member is in shutter releasing position and outside of said path while said shutter. releasing member is in shutter holding position and to be located-when said exposure setting member is in time exposure setting positionin the path of said engaging member while said shutter releasing member is in shutter holding position and outside of said path while said shutter releasing member is in shutter releasing position; and second catch means mounted on said turnable supporting member so as to be located in the path of said engaging member only when said exposure setting member is in time exposure setting position and said shutter releasing member is in shutter releasing position.

5. In a shutter blade actuating mechanism including a shutter blade; an engaging member mounted on said shutter blade; a shutter releasing member manually movable between shutter holding position and shutter releasing position; a manually operable turnable exposure setting knob adapted to be in bulb exposure setting position and in time exposure setting position and to be turned between said positions; and an operating double--armed lever operatively connected at one end to said exposure setting knob so that its position is adjusted by turning of said knob; the provision of a blocking arrangement comprising in combination a turnable supporting member turnably mounted on the other end of said operating levert; engaging means forming part of said turnable supporting member and engaging said shutter releasing member so that said turnable supporting member is turned by said shutter releasing member during movement of the same and is turned also by said engaging means during movement of .said operating double-armed lever by said manually operable exposure setting knob; 4first catch means mounted on said turnable supporting member so as to be located-when said exposure setting knob is in bulb exposure setting position-in the path of said engaging member while said shutter releasing member is in shutter releasing position and outside of said path while said shutter releasing member is in shutter holding position and to be located-when said exposure setting knob is in time exposure setting position-in the path of said engaging member While said shutter releasing member is in shutter holding position and outside of said path while said shutter releasing member is in shutter releasing position; and second catch means mounted on said turnable supporting member so as to be located in the path of said engaging member only when said exposure setting knob is in time exposure setting position and said shutter releasing member is in shutter releasing position.

6. In a shutter blade actuating mechanism including a shutter blade; an engaging member mounted on said shutter blade; a slidable shutter releasing member manually movable between shutter holding position and` shutter releasing position; spring means automatically returning said shutter releasing member from said shutter releasing position into said shutter holding position; a releasing projection mounted on said slidable releasing member and located in the path oi said engaging member when said shutter releasing member is in said shutter holding position and being moved out of said path of said engaging member when said shutter releasing member is in said shutter releasing position; a manually operable exposure setting knob adapted to be in bulb exposure setting position and in time exposure setting position and to be manually turned between said position; and an operating member cooperating at one end with said manually operable exposure setting knob and adjustable by the same during turning thereof; the provision of a blocking arrangement comprising in combination a turnable supporting plate pivoted to said operating member at the other end thereof; a first connecting member forming part of said turnably supporting plate; a second connecting member forming part of said slidable shutter releasing member and slidably engaging said iirst connecting member so as to be adapted to turn said turnable supporting plate during sliding movement of said slidable shutter releasing member and to cause also turning of said turnable supporting plate by said operating member during turning of the latter by said manually operable exposure setting knob; rst catch means mounted on said turnable supporting plate so as to be located-when said exposure setting knob is in first exposure setting position--in the path of said engaging member while said slidable shutter releasing member is in said shutter releasing position and outside of said path while said slidable shutter releasing member is in shutter holding position and to be located-when said exposure setting knob is in time exposure setting position-in the path of said engaging member while said slidable shutter releasing member is in said shutter holding position and outside of said path while said slidable shutter releasing member is in said shutter releasing position; and second catch means mounted on said turnable supporting plate so as to be located in the path of said engaging member only when said exposure setting knob is in time exposure position and said slidable shutter releasing member is in said shutter releasing position.

7. In a shutter blade actuating mechanism including a shutter blade; an engaging member mounted on said shutter blade; a slidable shutter releasing member manually movable between shutter holding position and shutter releasing position; spring means automatically returning said shutter releasing member from said shutter releasing position into said shutter holding position; a releasing projection mounted on said slidable releasing member and located in the path of said engaging member when said shutter releasing member is in said shutter holding position and being moved out of said path of said engaging member when said shutter releasing member is in said shutter releasing position; a manually operable exposure setting knob adapted to be in bulb exposure setting position and in time exposure setting position and to be manually turned between said positions; and an operating member cooperating at one end with said manually operable exposure setting knob and adjustable by the same during turning thereof; the provision of a blocking arrangement comprising in combination a turnable supporting plate p-ivoted to said operating member at the other end thereof; a slot arranged in said turnable supporting plate; a connecting pin mounted on said slidable shutter releasing member and slidably engaging said slot in said turnable supporting plate so as to be adapted to turn said turnable supporting plate during sliding movement of said slidable shutter releasing member and to cause also turning of said turnable supporting plate by said operating member during turning of the latter by said manually operable exposure setting knob; rst catch means mounted on said turnable supporting plate so as to be located-when said exposure setting knob is in rst exposure setting position-in the path of said engaging member while said slidable shutter releasing member is in said shutter releasing position and outside of said path while said slidable shutter releasing member is in shutter holding position and to be 1ocated--When said exposure setting knob is in time exposure setting position-in the path of said engaging member while said slidable shutter releasing member is in said shutter holding position and outside of said path while said slidable shutter releasing member is in said shutter releasing position; and second catch means mounted on said turnable supporting plate so as to be located in the path of said engaging member only when said exposure setting knob is in time exposure position and said slidable shutter releasing member is in said shutter releasing position.

JACQUES BOLSEY.

REFERENCES CITED The following references are of record in the i'lle of this patent:

UNITED STATES PATENTS Number Name Date 359,797 Lewis Mar. 22, 1887 853,000 Brownell May 7, 1907 1,917,330 Riddell July 11, 1933 2,412,559 Bolsey Dec. 17, 1946 

